revert changes in apisix_route_v2beta3.md

docs/en/latest/references/apisix_route_v2beta3.md

@@ -35,7 +35,6 @@ The table below describes each of the attributes in the spec. The fields `apiVer
 
 | Attribute                            | Type               | Description                                                                                                                                                                                 |
 |--------------------------------------|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| ingressClassName                                 | string              | Name of the ingress class. Used to target a specific controller that should implement the resource.                                                                                                                                                                         |
 | http                                 | array              | HTTP Route rules.                                                                                                                                                                           |
 | http[].name                          | string (required)  | Route rule name.                                                                                                                                                                            |
 | http[].priority                      | integer            | Route priority. Used to determined which Route to use when multiple routes contain the same URI. Large number means higher priority.                                                        |